Means for regulating the supply of air to sulfur or like furnaces.



D. N. HUNT. NG THE SUPPLY 0F AIR To SULPU R 011 LiKE PURNAGES.

MEANS P011 RBGULATI 1 ,O5 3, 9 l 5 e APPLICATION FILED SEPT. 20, 1912.

Patented Fb.18,1913.

supply may be led into t e furnace in suoliv UNITED STATES Fllilllllr @IiFlUFu DAVID NGEL HUNT, OF CHESHAIVI, ENGLAND.

MEANS FOR REGULATING' THE SPPL'Y 0F AIR TO SULFUR OPL LIKE FURNACES.

Specicaton of Letters Patent.

Tatente-d Feb. it

Application filed September 213, mi2. p Serial No. 721,486.

To aZZ whom it may concern.'

Be it known that I, DAVID NOEL HUNT, a subject of the King of Great Britain and Ireland, residing at St..Teilo, White Hill, Clieshain, in the county of Buckingham, England, have invented new and useful Improved Means for Regulating the Supply 0i. Air to Sulfur or Like Furnaces, of which the following is a specification.

The present invention relates to improved means for automatically regulating the supply of air to sulfur or like burning furnaces for controlling the strengthfof the gas particularly for preventing the sublimation of the sulfur, the object being to overcome the defect existing in such furnaces at present in use. According to lmown' constructions any variation in the air intake of the main supply for combustion purposes causes also a varying eiiect in the usual independent auxiliary intake and produces unsatisfactoigT Working of the furnace. l

ccording to the present invention l take an auxiliary pipe from the main air supply pipe at a point preferably near the iurnace and connect it directly to the combustion chamber and I provide such auxiliary pipe with a thermostatically controlled automatic valve, and, in order to accentuate its effect, the controllin or auxiliary air a manner that it is caused to impinge on the thermostat contained in thefurnace and by which the automatic valve is'operated.

In the accompanying drawing which illustrates this invention Figure 1 is al `longitudinal section, on line V-V Fig. 2, through the furnace. Fig. 2 is a view taken on the left side as a. section on line X-X and on the right side as a section on line Y-Y Fig. l7 and Fig. 3 is a part sectional plan on line W-W Fig. l, on an enlarged scale.

The furnace generali Iis of the usual construction and is provi ed with baflie plates a and furnace bars b upon Which the sulfur is placed and ignited. Air for combustion purposes is supplied through inlet pipe d in the usual Way. A thermostat f is provided in the upper part of the furnace and means are provided for mechanical connection with the valve g for controlling the auxiliary air supply. I

The auxiliary air supply pipe e, according to this invention is taken ott the main supply pipe at a point preferably near the :furnace (Fig. 2) andintroduced 'into the furnace at a point preferably near the thermostat j' so that the secondary combustion takes place' in close proximity to thethe'rmostat f. The valve g situated within the auxiliary supply pipe is maintained in a normally closed condition by a light spring furnace and at its other end to ai bar j se'- cured to' the spindle of the valve g passing to the outsideot the pipe e the other'end of the bar j being operated by an arm Z3 carried by the thermostat f. A stud Z is adjustably mounted in a slot formed in the bar j for determining the commencement and extent of operation of ine valve g.

The operation of a furnace constructed in accordance with this invention is 'as follovvs:-Sulfur is placed on the bars b and ignited, as the burning progresses the temperature increases and the sulfur falls from the bars to the bottom c of the furnace Where it continues to burn and generate gas,^and, due to the combination o? the air with the burning sulfur, the latter is raised above its ignition point to its boiling or vaporizing oxygen of the main'air supply combines with the sulfur.A The thermostat due to the heat of the furnace, expands, and the arm 71: is caused to bear against the stud and turn `the bar j thus opening the valveli g. The auxiliary air supply is thus gradually admitted into the furnace and the .iiapor is caused to burn up While it is still altrove its ignition point. The heat of the auxiliary combination is formed in close proximity to the thermostat f and causes an intensir'ication of its action. In this manner a rise of temperature Within the furnace due Vto the combustion of the sulfur causes air ,to be admitted through the auxiliary pipe, which air causes a secondary combustion stat thereby preventing any sublimation of the sulfur. Should 'an excess of air be admitted through` valve g it tends to cool the thermostat f Which then contracts and allows valve g to close and thus reduce the supply of air.

The auxiliary air supply being obtained from the main air supply pipe Will not vary in its proportion to the main supply even should there be fairly Wide changes in the main air supply pressure. If this automatic control of the auxiliarysupply were not used a vaporized portion of the sulfur to take place in proximity to the therino-v a connected atene end to a fixed part of the point, when in this state all or nearly all the Se in the lii'mic sind' pass over: f the outet 7L becoming deposiiud :is alici in the outlet passages beyond fue fm*- ime, @rement 4ii/'lici'i Skilled supeivision hws im empioyed whereas with my in *imi unskilled peron can Work the plant is its effective wmfking ifi/entirely 'Lumley Conil-@i automaticaiiy ieguizited by @he wimpel-Mure @i the furnace,

m thug uiiy described my invenciaim as new and desir@ 1:0 secure winprising a casing, furnace main nii' supply pipe Qxieuf'ing l J mmice and. d' 'osed between the @if 'mtii mii j/he furriwiiz imiiim'y xiii Supply pip@ imifing )if pipe into ih@ up Li'imc and jfmmeci with u.

row of iaigiinudinaily disposed ports, 2L c011- roiing valve in ihe auxiliary pipe, a thermostat im-angled in the upper part of the furnace in a position to be inuenced by the air issuing from the ports oi' he auxiliary ai;7 Supply pipe, and means connecting the thmmostat with tha Controlling valve adapted to regulate said auxiliary valve so s increase o? dccmzise the HOW of air through ih@ auxiliary air supply as die cempeintuy'e of the, thrmosmt fiseS and falls respectively, subcmiitiaiiy ma descifibed.

in esiimony Wherecii .have signed my y name to his specification in the presence of tw@ subscribing Witnesses.

DAVD 'NUEL HUNT.

Witiuesss iczmnn A., 'ioifFMAN N, JVAL'LHR CARVER. 

